Patent · US Expired

Hydrophilic, highly swellable hydrogels

US5840321A · kind A · utility

27Cited by

0References

16Claims

0Family size

Assignee

Clariant Corporation · DE

Inventors

Fritz Engelhardt · Frankfurt am Main, DE
Uwe Stuven · Bad Soden, DE
Thomas Daniel · Waldsee, DE
Norbert Herfert · Charlotte, US

Key dates

Filing date	Jul 8, 1996
Grant date	Nov 24, 1998
Priority date	—
Expiry date	Jul 8, 2016

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2491/08
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to hydrophilic, highly swellable hydrogels which are coated with nonreactive, water-insoluble waxes in a quantity of from about 0.05 to about 2% by weight, based on uncoated hydrogel.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.